Restore Your Vehicle’s Performance and Reliability
A faulty Engine Control Module (ECM) can be the source of countless frustrating and hard-to-diagnose issues, from a persistent check engine light to a vehicle that won’t start at all. Take the guesswork out of the repair with this genuine GM engine computer. This isn’t just a replacement part; it’s a complete, ready-to-install solution. We professionally program the module to your vehicle’s unique VIN using the latest official GM software updates. This critical step ensures perfect communication between the ECM and all other vehicle systems, restoring the smooth operation and efficiency you expect from your vehicle.
Common Symptoms of a Failing ECM & Your Direct Solution
If you’re experiencing any of the following issues, a failing ECM is a likely culprit. This pre-programmed module is designed to be the definitive solution for:
- Check Engine Light (CEL) that won’t go away
- Vehicle cranks but will not start
- Rough or erratic idling
- Noticeable decrease in fuel economy
- Engine stalling or misfiring
- Transmission shifting problems
- Error codes related to processor failure (e.g., P0601, P0606) or communication errors
By ordering our Programmed GM ECM 12678512, you are getting a component that is ready to resolve these issues right out of the box, saving you a costly trip to the dealership for programming.
Features & Benefits
- ✔ VIN-Specific Programming Included: We flash the module with your vehicle’s VIN, ensuring a true plug-and-play installation with no extra steps required.
- ✔ Loaded with Latest GM Software: Your ECM arrives with the most current factory software, optimizing engine performance, fuel efficiency, and emissions control.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for a wide range of service numbers, including 12636659, 12639300, 12628993, and more, covering dozens of GM models.
- ✔ Restores Factory Function: Eliminate frustrating drivability problems and restore the precise engine management your vehicle had when it was new.
- ✔ Cost-Effective Dealership Alternative: Get a fully functional, programmed module without the high costs and scheduling hassles of a dealership service center.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Expert’s Note on ECM Replacement: As a technician with over two decades of experience, I can tell you that replacing an ECM used to be a two-part nightmare. First, you’d install the hardware. Then, you’d have to tow the vehicle to a dealer or find a specialty shop with thousands of dollars in scan tools to perform the programming. It was time-consuming and expensive. Our service completely eliminates that second, costly step. We handle the complex programming on our end, so when the part arrives at your door, the most difficult part of the job is already done. This is the smartest way to tackle an ECM replacement for any DIY mechanic or professional shop.
This Programmed GM ECM 12678512 is the brain of your vehicle’s engine, and ensuring it has the correct, updated software is critical for long-term health and performance. Don’t settle for a blank module that leaves you stranded. Order this complete solution and get your GM car, truck, or SUV back on the road quickly and reliably.
Frequently Asked Questions
What is the process after I place my order?
It’s simple. After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot ship the part until we have this information. Once we receive your VIN, our technicians will program the ECM with the latest GM software specific to your vehicle. The part is then securely packaged and shipped to you.
Will I need to do any additional programming or a security relearn?
In most cases, this module is a direct plug-and-play installation and will not require any additional work. However, on certain GM models, a simple security relearn procedure (often called a ‘key relearn’) may be necessary, which can typically be done without any special tools. Instructions for this are widely available online or in service manuals.
Where can I find my vehicle’s VIN?
Your VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
How do I know if this fits my vehicle?
Please review the detailed fitment list on this page. This ECM is compatible with a wide variety of GM models and years. The most important step is to provide your VIN during checkout, as we use it to confirm compatibility and program the module correctly for your specific vehicle options.
What if my original part number is not 12678512?
This ECM, part number 12678512, is an interchangeable replacement for many other GM service numbers, such as 12636659, 12639300, and 12628993. As long as your vehicle is on the compatibility list, this part will function correctly once programmed to your VIN.
What does the warranty cover?
This unit is backed by our one-year replacement warranty. This covers the part against failure or defects for one full year from the date of purchase. We will provide a replacement unit if the original part fails within the warranty period.